Screw-cutting machine.



PATENTED OCT. 18, 1904.

E. LANGE. SCREW CUTTING MACHINE;

APPLICATION FILED JAN. 26, 1902.

N0 MODEL.

2 SHEETS-SHEET 1.

M ,6 I a;

h Z in ear 6 u" PATENTED OCT. 18, 1904 E. LANGE. SCREW. CUTTING MACHINE.

, APPLICATION FILED JAN. 20, 1902.

' no MODEL.

2 SHEETS-SHEET 2.

I l I l l l l Hi u UNITED STATES Patented October 18, 1904.

PATENT OFFICE.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 772,362, dated October 18, 1904;. Application filed January 20, 1902. serial No. 90,407. (No model.)

To all whowb it may concern:

Be it known that I, ERNST LANGE, a subject of the Emperor of Germany,residing at Cronenberg, in the Province of Rhenish Prussia,

G-ermany, have invented a new and useful Improvement in Screw-Cutting Machines, of which the following is a specification.

My invention relates to improvements in machines for cutting thread to wire blanks; and it consists in certain features of construction and in combination of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a front elevation of the complete machine. Fig. 2 is a plan thereof. Fig. 3 is a vertical section taken along line I I of Fig. 2. Fig.

4 is a view seen from the right side of Fig. 1. Fig. 5 is a view seen from left side of Fig. 1. Fig. 6 is a vertical section alongline III III of Fig. 2. Fig. 7 is a section along line II II of Fig. 2. Fig. 8 is a horizontal section through the chuck. Fig. 9 is a similar section through the tool device. Fig. 10 shows a plan of the cutter. Fig. 1 1 is a face view thereof; Fig. 12, a section through the cutter.

Like characters .of reference indicate like parts in the drawings.

1 represents the bed of the machine; 2, the live-spindle, journaled in bearings 3 and carrying the pulley 4. The live-spindle 2 is provided in front with the chuck 5, the rear end of which carries a pinion 6. Said pinion engages a gear 7. To the hub of this gear is rigidly secured a pinion 8. Pinion 8 meshes with a gear 9, seated on shaft 10. On said shaft is mounted a cam 11, that operates a lever 12, which serves to open and close the chuck 5. The latter, though being of known construction, may be briefly described as follows: In the chuck 5 are pivotally secured on a pivot a two jaws 9 carrying the adjustable dies .9. The jaws are operated upon by a wedged rod a, guided in the live-spindle 2, the end of said rod a being connected with the lever 12, so that the wedge u, extending from the rod it, closes the jaws when the said rod is pushed inward by the said lever 12. The opening of the jaws is effected by means of a spring 13, that shifts the lever l2sidewise when released by the cam 11 and a spring 13.

The feeding device for the blanks is arranged as follows: 14 is the hopper for the blanks, fastened to a bell-crank lever 16, Fig. 6, which is arranged to oscillate on a bolt 15. In the hopper-case is journaled a revolving spindle 19, to which are keyed two disks 18, being separated from each other about the thickness of a blank. To the spindle 19 is also keyed a pulley 20, which is connected by a cord 22 with a pulley 21, seated on shaft 15. The pulley 21 has an adjacent pulley m, which is connected by a cord .2 with a pulley 23, that is keyed to a shaft 24. On the latter is fixed a bevel-wheel 25, which engages another bevelwheel 25, seated on shaft 10. On shaft 24 is fixed a cam 26. This cam operates the bellcrank lever 16 on its pivot 15 and in turning this lever causes a raising and lowering of the hopper-case. IVhen the hopper-case is in its normal position, as shown in Fig. 6, the feeding of the blanks takes place. The blanks are caught by the revolving disks 18 withtheir shafts between them. They are carried round by said disks and introduced into the conveyerchute 27 in a horizontal position. In said chute the blanks rest on pins 28, as shown in Figs. 6 and 7. These pins are reciprocated in order for delivering the blanks t0 the chuck. For this purpose the upper pin 27 is seized by a lever-arm 50 and the two lower pins by a lever-arm 51, both arms being turnably secured to a bolt 52. Springs 53 are provided to draw the lever-arms against cam-disks 53 53, and from this it will be clear that by the combined action of the springs and lever-arms the pins 27 28 are reciprocated. The upper pins when removed allow the blank to drop on the lower, and these pins again furnish the blank on a support 29, and now the blank lies in the center line of the live-spindle 2 and the chuck 5, into which it is now inserted. This is done by a rod 30, which is guided in a piece 31 and is provided with a spring Said piece 31 is pivotally secured to the hopperstandard 14. The piece 31 is pivotally secured, because it places itself in the middle line of the blank when in operation. When the cutter engages the blank, its bearing 38 would be hindered by the said piece 31, and as the same is pivoted it ispushed away by the bearing 38, the pinion 30 being operated upon by a double-armed lever 33, on which acts a cam 33, and is rapidly moved forward by said cam and said lever and the blank thus shifted into the chuck, which is closed in the manner described before. Now the hopper is lifted to allow the blank-supporter to engage the blank and the tool to work.

The supporter 34, Figs. 2 and 7, is of known construction. It is pivoted on a bolt 60 and engaged by a cam 35, which bears the holder 34 against the blank. A spring 61 draws it back, when a fresh blank will be fed.

The tool 36, Figs. to 12, consists of a cylindrical disk which is provided with a hole 62 and has on its circumference engraved a number of screw-threads, which correspond with the length of the blank to be provided with thread.

The threads on the cutter are crossed by grooves 37, placed obliquely or under an acute angle with regard to the axis of the disk 36, so that a number of cutting-teeth 63 are formed, lying in steps on the disk-body and cutting first with the projecting edge the rough thread into the blank and then with the subsiding edges the finished thread.

The cutter 36 is secured on a shaft 45, which is journaled in the head 38 of a double-armed "lever 39, that is pivoted on a shaft 40. As

seen in Fig. 9, the shaft 45 may be adjusted lengthwise, for which purpose it is provided with a screw-thread and nuts 65, offering a hold to the shaft in its adjusted position. The shaft 40 is revolved by the gear 41 42 from the live-spindle 2, and it transmit rotation to the shaft 45 by means of the gear 43 44. In order to adjust the cutter lengthwise, as described before, the gear 44 is made correspondingly broad. The cutter pressed against the blank for cutting the thread. For this purpose arm 46 of lever 39 bears upon a lever 47, on the rear end of which acts a cam' 33, by means of which the cutter is pressed against the blank.

is also Having now described my invention, I desire to secure by Letters Patent 1. In a machine of the class indicated having a live-spindle and a chuck the combination of a hopper-case 14, a shaft pivotally supporting said hopper-case, a cam 26, means whereby the cams may oscillate said case, two blank-conveying disks 18 inclosed in said case, means to revolve the disks, a conveying-chute extending from the hopper-case, supportingpins 28, means to reciprocate said pins, a supporting plate 29, for the blanks a spring push-pin 30, a lever and a cam for transferring the blanks from the supporting-plate to the chuck.

2. In a machine of the class described, having a live-spindle and a chuck a hopper-case 14, a shaft pivotally supporting said case, a chute ending in a supporting-plate and a lever-arm extending from said case, a revolving cam 26 engaging said arm, a piece 31 pivoted to the hopper-case and a spring-pin journaled in said piece 31, a lever 33 for driving said pin and a cam 33 for oscillating said lever and an oscillating tool-holder mounted to rock into the plane of the part 31 and of the work, as described and for'the purpose set forth.

3. In a machine of the class described having alive-spindle and a chuck the combination of a tool 36 carrying onits circumference obliquely-arranged cutting-teeth, a holder 38, 39, receiving said tool, arevolving shaft pivotally supporting the holder, a lever 47 hearing against the tool-holder, a cam for oscillating said lever, a gear 43, 44 for transmitting motion from shaft 40 to the tool as described and for the purpose set forth.

ERNST LANGE.

Witnesses:

J. A. RrrTERsHAUs, Or'ro KONIG. 

